封裝自己的yQuery

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function myAddEvent(obj, sEv, fn) {    if (obj.attachEvent) {        obj.attachEvent(‘on‘ + sEv, fn)    } else {        obj.addEventListener(sEv, fn, false);    }}function getByClass(oParent, sClass) {    var aEle = oParent.getElementByTagName(‘*‘);    var aResult = [];    var i = 0;        for (var i = 0; i <aResult.length; i++) {        aResult.push(aEle[i]);    }    return aResult;}function VQuery(vArg) {    //用來儲存選中的元素    this.elements = [];    switch (typeof vArg) {        case ‘function‘:            //window.onload = vArg;            myAddEvent(window, ‘load‘, vArg);            break;        case ‘string‘:            switch (vArg.charAt(0)) {                case ‘#‘:   //ID                    var obj = document.getElementById(vArg.substring(1));                    this.elements.push(obj);                    break;                case ‘.‘:   //class                    getByClass(document, vArg.substring(1));                    break;                default:    //tagName                    this.elements = document.getElementsByTagName(vArg);            }                            break;        case ‘object‘:            this.elements.push(vArg);            break;    }}VQuery.prototype.click = function (fn) {    var i = 0;    for (var i = 0; i < this.elements.length; i++) {        myAddEvent(this.elements[i], ‘click‘, fn);    }}function $(vArg) {    return new VQuery(vArg);}